U.S. patent application number 17/315216 was filed with the patent office on 2021-08-26 for intermediate gas concentration-regulating piston pressure device for high-temperature autoclave and gas distribution method.
This patent application is currently assigned to Southwest Petroleum University. The applicant listed for this patent is Engineering Technology Research lnstitute,Southwest Oil and Gas Field Company of Petro China, Southwest Petroleum University. Invention is credited to Jian Ding, Duo Hou, Yufei Li, Jinming Liu, Wei Luo, Pengfei Sang, Chuanlei Wang, Jiawei Wang, Huali Zhang, Lin Zhang, Zhi Zhang, Yuanjin Zhao.
Application Number | 20210260547 17/315216 |
Document ID | / |
Family ID | 1000005634862 |
Filed Date | 2021-08-26 |
United States Patent
Application |
20210260547 |
Kind Code |
A1 |
Zhang; Zhi ; et al. |
August 26, 2021 |
INTERMEDIATE GAS CONCENTRATION-REGULATING PISTON PRESSURE DEVICE
FOR HIGH-TEMPERATURE AUTOCLAVE AND GAS DISTRIBUTION METHOD
Abstract
A piston pressure device includes a gas concentration-regulating
piston pressure device and a high temperature autoclave. In the gas
concentration-regulating piston pressure device, the proportion and
concentration of corrosive gases can be accurately adjusted,
intermediate gases can be stored and filled into the high
temperature autoclave according to experimental needs, and an
actual corrosion process in oilfield is accurately simulated.
Meanwhile, the corrosive gases can be supplemented in real time
during the experiment, and dynamic gas distribution in a
high-temperature high-pressure corrosion experiment process is
realized. The present invention has the advantages as follows: the
piston pressure device is resistant to high temperature and high
pressure, corrosion-resistant, simple in structure and convenient
to operate; the concentration and proportion of the corrosive gases
are accurately controlled to be invariable in the high-temperature
high-corrosion experiment process; and reliability of
high-temperature high-pressure corrosive experimental results is
increased.
Inventors: |
Zhang; Zhi; (Chengdu,
CN) ; Liu; Jinming; (Chengdu, CN) ; Zhang;
Huali; (Chengdu, CN) ; Li; Yufei; (Chengdu,
CN) ; Wang; Jiawei; (Chengdu, CN) ; Hou;
Duo; (Chengdu, CN) ; Ding; Jian; (Chengdu,
CN) ; Zhao; Yuanjin; (Chengdu, CN) ; Zhang;
Lin; (Chengdu, CN) ; Luo; Wei; (Chengdu,
CN) ; Wang; Chuanlei; (Chengdu, CN) ; Sang;
Pengfei; (Chengdu, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Southwest Petroleum University
Engineering Technology Research lnstitute,Southwest Oil and Gas
Field Company of Petro China |
Chengdu
Chengdu |
|
CN
CN |
|
|
Assignee: |
Southwest Petroleum
University
Engineering Technology Research lnstitute,Southwest Oil and Gas
Field Company of Petro China
|
Family ID: |
1000005634862 |
Appl. No.: |
17/315216 |
Filed: |
May 7, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B01J 3/002 20130101;
F04C 25/02 20130101 |
International
Class: |
B01J 3/00 20060101
B01J003/00; F04C 25/02 20060101 F04C025/02; F04C 23/00 20060101
F04C023/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 7, 2020 |
CN |
202010643480.9 |
Claims
1. An intermediate gas concentration-regulating piston pressure
device for a high temperature autoclave, comprising: a gas
concentration-regulating piston pressure device and a high
temperature autoclave (21), wherein the gas
concentration-regulating piston pressure device comprises a plug
(1), a cylinder (5), a piston (6), a base (8), an oil tank (12,) an
oil pipe, a gas inlet pipeline (14), a gas outlet pipeline (15), a
vacuum pump (17), a four-way valve (18) and a high temperature
autoclave ventilation connection pipeline (19); the piston (6) is
arranged in the cylinder (5); an opening in an upper end of the
cylinder (5) is sealed by the plug (1); and the plug (1) is fixed
on the cylinder (5) via a screw (3); a concentration probe (4) and
a ventilation connection pipeline (2) are mounted on the plug (1),
both penetrate through the plug (1) and are communicated with an
interior of the cylinder (5); the concentration probe (4) is used
for detecting a gas concentration inside the cylinder (5); and when
an injected gas is a single gas, a concentration of the injected
gas is acquired by the concentration probe (4); and the ventilation
connection pipeline (2) is further provided with a gas inlet valve
(13); an oil transport hole is formed in a lower end of the
cylinder (5); an oil pump (11) is arranged in the oil tank (12);
two ends of the oil pipe are respectively connected to the oil pump
(11) and the oil transport hole; the oil pipe is further provided
with a control valve (10) and a flowmeter (9); the oil pump (11) is
used for pumping oil in the oil tank (12) into the cylinder (5);
and the piston (6) is pushed onto a top of the cylinder (5); the
other end of the ventilation connection pipeline (2) is connected
to the four-way valve (18); and the gas inlet pipeline (14), the
ventilation connection pipeline (2), the gas outlet pipeline (15)
and the high temperature autoclave ventilation connection pipeline
(19) are connected onto the four-way valve (18); the four-way valve
(18) can open or close any one or more valve ports; the gas inlet
pipeline (14) is connected to a booster pump (16) for boosting the
concentration-regulating piston pressure device; the gas outlet
pipeline 15 is connected to a vacuum pump (17) for vacuumizing the
concentration-regulating piston pressure device; the high
temperature autoclave ventilation connection pipeline (19) is
connected to the high temperature autoclave (21); and a valve (20)
is mounted on the high temperature autoclave ventilation connection
pipeline (19); a base (8) is mounted at the bottom of the cylinder
(5) for fixing the whole concentration-regulating piston pressure
device; a concentration probe (22) is arranged in the high
temperature autoclave (21) to monitor a concentration of gases
inside the autoclave in real time; the high temperature autoclave
(21) is further provided with an exhaust valve (23).
2. A gas distribution method of the intermediate gas
concentration-regulating piston pressure device for the high
temperature autoclave of claim 1, comprising steps of: pumping
hydraulic oil into a cylinder (5) by utilizing an oil pump (11) and
an oil tank (12) before gas filling; pushing a piston (6) to the
top of the cylinder (5); vacuumizing the interior of the cylinder
(5) by utilizing a vacuum pump (17); removing a pressure of the
hydraulic oil; opening a gas inlet valve (13); determining a
relative proportion of gases in advance if two or more gases exist;
monitoring flow of the hydraulic oil according to a flowmeter (9);
determining introduction amounts of different gases by utilizing a
volumetric method; and finally, pushing proportioned gases into a
high temperature autoclave (21) and performing auxiliary boosting
by a booster pump (15) if a pressure of the high temperature
autoclave (21) is high.
3. The gas distribution method of the intermediate gas
concentration-regulating piston pressure device for the high
temperature autoclave according to claim 1, wherein change of a gas
concentration in a corrosion reaction process of the high
temperature autoclave (21) is monitored by a concentration probe
(22) in real time; a new gas ratio is prepared by the gas
concentration-regulating piston pressure device; the hydraulic oil
is pumped into the cylinder (5) by utilizing the oil pump (11) and
the oil tank (12) before gas filling; the piston (6) is pushed to
the top of the cylinder (5); the interior of the cylinder (5) is
vacuumized by utilizing the vacuum pump (17); the pressure of the
hydraulic oil is removed; and the gas inlet valve (13) is opened;
if the injected gas is a single gas, the concentration of the
injected gas is acquired by the concentration probe (22); if two
and more gases exist, the relative proportion of the gases is
determined in advance; flow of the hydraulic oil is monitored
according to the flowmeter (9); introduction amounts of different
gases are determined by utilizing the volumetric method; the gases
in the high temperature autoclave are discharged by an exhaust
valve (23); then a valve (20) is opened to inject gases of a new
ratio; gas concentrations in the high temperature autoclave (21)
are regulated at any time; and the gases are supplemented, thereby
simulating various gas-drive gas production conditions and
simulating a dynamic change process of the gases when field working
conditions are changed.
Description
CROSS REFERENCE OF RELATED APPLICATION
[0001] The present invention claims priority under 35 U.S.C.
119(a-d) to CN 202010643480.9, filed Jul. 7, 2020.
BACKGROUND OF THE PRESENT INVENTION
Field of Invention
[0002] The present invention belongs to the technical field of high
temperature autoclave experiments, and particularly relates to an
intermediate gas concentration-regulating piston pressure device
for a high temperature autoclave and a gas distribution method.
Description of Related Arts
[0003] Conventionally, when a corrosion experiment is conducted by
a high temperature autoclave in a lab, H.sub.2S, CO.sub.2, O.sub.2,
CH.sub.4 and N.sub.2 gas bottles are directly connected to a
booster pump so as to fill the gases into the high temperature
autoclave body. Concentrations of the filled gases are determined
by virtue of partial pressures of the filled gases. However, when
the temperature and pressure are changed, the partial pressures of
the filled gases are dynamically changed, and a gas concentration
ratio cannot be accurately simulated in an actual high-temperature
high-pressure working condition. Moreover, in the experimental
process, the gases cannot be supplemented in real time when the gas
concentration is decreased; the actual working conditions in
oilfield cannot be accurately simulated; and a certain deviation
exists between the tested corrosion rate and the actual working
conditions. Therefore, accurately preparing the corrosive gas
concentration is the key of increasing consistency of the simulated
high-temperature high-pressure corrosion experiment and the actual
working conditions. However, there has been no device that can
realize accurate preparation of the corrosive gas concentration of
the high temperature autoclave at present.
SUMMARY OF THE PRESENT INVENTION
[0004] With respect to the defects in the prior art, the present
invention provides an intermediate gas concentration-regulating
piston pressure device for a high temperature autoclave and a gas
distribution method, thereby solving the defects in the prior
art.
[0005] To achieve the above inventive purpose, technical solutions
of the present invention are as follows:
[0006] The intermediate gas concentration-regulating piston
pressure device for the high temperature autoclave includes a gas
concentration-regulating piston pressure device and a high
temperature autoclave.
[0007] The gas concentration-regulating piston pressure device
includes a plug, a cylinder, a piston, a base, an oil tank, an oil
pipe, a gas inlet pipeline, a gas outlet pipeline, a vacuum pump, a
four-way valve and a high temperature autoclave ventilation
connection pipeline.
[0008] The piston is arranged in the cylinder; an opening in an
upper end of the cylinder is sealed by the plug; and the plug is
fixed on the cylinder via a screw.
[0009] A concentration probe and a ventilation connection pipeline
are mounted on the plug, both penetrate through the plug and are
communicated with an interior of the cylinder; the concentration
probe is used for detecting a gas concentration inside the
cylinder; and when an injected gas is a single gas, a concentration
of the injected gas is acquired by the concentration probe. The
ventilation connection pipeline is further provided with a gas
inlet valve.
[0010] An oil transport hole is formed in a lower end of the
cylinder; an oil pump is arranged in the oil tank; two ends of the
oil pipe are respectively connected to the oil pump and the oil
transport hole; the oil pipe is further provided with a control
valve and a flowmeter; the oil pump is used for pumping oil in the
oil tank into the cylinder; and the piston is pushed onto a top of
the cylinder.
[0011] The other end of the ventilation connection pipeline is
connected to the four-way valve; and the gas inlet pipeline, the
ventilation connection pipeline, the gas outlet pipeline and the
high temperature autoclave ventilation connection pipeline are
connected onto the four-way valve.
[0012] The four-way valve can open or close any one or more valve
ports itself.
[0013] The gas inlet pipeline is connected to a booster pump for
boosting the concentration-regulating piston pressure device.
[0014] The gas outlet pipeline is connected to a vacuum pump for
vacuumizing the concentration-regulating piston pressure
device.
[0015] The high temperature autoclave ventilation connection
pipeline is connected to the high temperature autoclave; and a
valve is mounted on the high temperature autoclave ventilation
connection pipeline.
[0016] A base is mounted at a bottom of the cylinder for fixing the
whole concentration-regulating piston pressure device.
[0017] A concentration probe is arranged in the high temperature
autoclave to monitor a concentration of gases inside the autoclave
in real time.
[0018] The high temperature autoclave is further provided with an
exhaust valve.
[0019] The present invention further discloses a gas distribution
method of the intermediate gas concentration-regulating piston
pressure device for the high temperature autoclave, including steps
of:
[0020] pumping hydraulic oil into a cylinder by utilizing an oil
pump and an oil tank before gas filling; pushing a piston to the
top of the cylinder; vacuumizing the interior of the cylinder by
utilizing a vacuum pump; removing a pressure of the hydraulic oil;
opening a gas inlet valve; determining a relative proportion of
gases in advance if two or more gases exist; monitoring flow of the
hydraulic oil according to a flowmeter; determining introduction
amounts of different gases by utilizing a volumetric method; and
finally, pushing proportioned gases into a high temperature
autoclave, and performing auxiliary boosting by a booster pump if a
pressure of the high temperature autoclave is high.
[0021] Further, change of a gas concentration in a corrosion
reaction process of the high temperature autoclave is monitored by
a concentration probe in real time; a new gas ratio is prepared by
the gas concentration-regulating piston pressure device; the
hydraulic oil is pumped into the cylinder by utilizing the oil pump
and the oil tank before gas filling; the piston is pushed to the
top of the cylinder; the interior of the cylinder is vacuumized by
utilizing the vacuum pump; the pressure of the hydraulic oil is
removed; and the gas inlet valve is opened.
[0022] If the injected gas is a single gas, the concentration of
the injected gas is acquired by the concentration probe.
[0023] If two and more gases exist, the relative proportion of the
gases is determined in advance; flow of the hydraulic oil is
monitored according to the flowmeter; and introduction amounts of
different gases are determined by utilizing the volumetric method.
The gases in the high temperature autoclave are discharged by an
exhaust valve; then a valve is opened to inject gases of a new
ratio; gas concentrations in the high temperature autoclave are
regulated at any time; and the gases are supplemented, thereby
simulating various gas-drive gas production conditions and
simulating a dynamic change process of the gases when field working
conditions are changed.
[0024] Compared with the prior art, the present invention has
advantages as follows:
[0025] With respect to the defects that the conventional high
temperature autoclave device cannot accurately simulate gas
concentrations, the present invention provides a piston pressure
device, which can accurately simulate the actual corrosion process
in oilfield, is resistant to high pressure, corrosion-resistant and
simple in structure, and can accurately prepare proportions and
concentrations of corrosive gases, store intermediate gases and
fill the gases into the high temperature autoclave according to
experimental needs, and accurately control the concentration and
proportion of the corrosive gases to be invariable in the
high-temperature high-corrosion experiment process. Meanwhile, the
corrosive gases can be supplemented in real time during the
experiment; dynamic gas distribution in the high-temperature
high-pressure corrosion experiment process is realized; and
reliability of high-temperature high-pressure corrosive
experimental results is increased.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIGURE is a structural schematic diagram of an intermediate
gas concentration-regulating piston pressure device for a high
temperature autoclave in embodiments of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0027] To make the purposes, technical solutions and advantages of
the present invention clearer, the present invention will be
further described in detail below in accordance with drawings and
illustrated embodiments.
[0028] As shown in FIGURE, an intermediate gas
concentration-regulating piston pressure device for a high
temperature autoclave includes a gas concentration-regulating
piston pressure device and a high temperature autoclave 21.
[0029] The gas concentration-regulating piston pressure device
includes a plug 1, a cylinder 5, a piston 6, an oil tank 12, a base
8 and an oil pipe.
[0030] The piston 6 is arranged in the cylinder 5; an opening in an
upper end of the cylinder 5 is sealed by the plug 1; and the plug 1
is fixed on the cylinder 5 via a screw 3.
[0031] A concentration probe 4 and a ventilation connection
pipeline 2 are mounted on the plug 1, both penetrate through the
plug 1 and are communicated with an interior of the cylinder 5; the
concentration probe 4 is used for detecting a gas concentration
inside the cylinder 5; and when an injected gas is a single gas, a
concentration of the injected gas is acquired by the concentration
probe 4. The ventilation connection pipeline 2 is further provided
with a gas inlet valve 13.
[0032] An oil transport hole is formed in a lower end of the
cylinder 5; an oil pump 11 is arranged in the oil tank 12; two ends
of the oil pipe are respectively connected to the oil pump 11 and
the oil transport hole; the oil pipe is further provided with a
control valve 10 and a flowmeter 9; the oil pump 11 is used for
pumping oil in the oil tank 12 into the cylinder 5; and the piston
6 is pushed onto a top of the cylinder 5.
[0033] The other end of the ventilation connection pipeline 2 is
connected to a four-way valve 18; and a gas inlet pipeline 14, a
ventilation connection pipeline 2, a gas outlet pipeline 15 and a
high temperature autoclave ventilation connection pipeline 19 are
connected onto the four-way valve 18.
[0034] The four-way valve 18 can open or close any one or more
valve ports itself.
[0035] The gas inlet pipeline 14 is connected to a booster pump 16
for boosting the concentration-regulating piston pressure
device.
[0036] The gas outlet pipeline 15 is connected to a vacuum pump 17
for vacuumizing the concentration-regulating piston pressure
device.
[0037] The high temperature autoclave ventilation connection
pipeline 19 is connected to the high temperature autoclave 21; and
a valve 20 is mounted on the high temperature autoclave ventilation
connection pipeline 19.
[0038] The base 8 is mounted at the bottom of the cylinder 5 for
fixing the whole concentration-regulating piston pressure
device.
[0039] A concentration probe 22 is arranged in the high temperature
autoclave 21 to monitor a concentration of gases inside the
autoclave in real time.
[0040] The high temperature autoclave 21 is further provided with
an exhaust valve 23.
[0041] A gas distribution method of the intermediate gas
concentration-regulating piston pressure device for the high
temperature autoclave is as follows:
[0042] Before the gases enter the high temperature autoclave 21,
partial pressures and concentrations of the gases are regulated by
a built-in piston method; and the gases are filled into the high
temperature autoclave 21, thereby ensuring that the concentration
and proportion of the gases are always invariable regardless of
change of the total pressure, supplementing corrosive gases in real
time during the experiment and realizing dynamic gas distribution
in the corrosion experiment process.
[0043] The method includes the following specific steps: pumping
hydraulic oil into a cylinder 5 by utilizing an oil pump 11 and an
oil tank 12 before gas filling; pushing a piston 6 to the top of
the cylinder 5; vacuumizing the interior of the cylinder 5 by
utilizing a vacuum pump 17; removing a pressure of the hydraulic
oil; opening a gas inlet valve 13; determining a relative
proportion of the gases in advance if two or more gases exist;
monitoring flow of the hydraulic oil according to a flowmeter 9;
determining introduction amounts of different gases by utilizing a
volumetric method; and finally, pushing proportioned gases into a
high temperature autoclave 21, and performing auxiliary boosting by
a booster pump 15 if a pressure of the high temperature autoclave
21 is high.
[0044] The gas concentration-regulating piston pressure device may
realize other functions as follows: change of a gas concentration
in a corrosion reaction process of the high temperature autoclave
21 is monitored by a concentration probe 22 in real time; a new gas
ratio is prepared by the gas concentration-regulating piston
pressure device; the hydraulic oil is pumped into the cylinder 5 by
utilizing the oil pump 11 and the oil tank 12 before gas filling;
the piston 6 is pushed to the top of the cylinder 5; the interior
of the cylinder 5 is vacuumized by utilizing the vacuum pump 17;
the pressure of the hydraulic oil is removed; and the gas inlet
valve 13 is opened.
[0045] If the injected gas is a single gas, the concentration of
the injected gas is acquired by the concentration probe 22; if two
and more gases exist, the relative proportion of the gases is
determined in advance; flow of the hydraulic oil is monitored
according to the flowmeter 9; and introduction amounts of different
gases are determined by utilizing the volumetric method. The gases
in the high temperature autoclave are discharged by an exhaust
valve 23; then a valve 20 is opened to inject gases of a new ratio;
gas concentrations in the high temperature autoclave 21 are
regulated at any time; and the gases are supplemented, thereby
accurately simulating various gas-drive gas production conditions
and simulating a dynamic change process of the gases when field
working conditions are changed.
[0046] Those ordinary skilled in the art may recognize that, the
embodiments described herein are used to help readers to understand
the implementation method of the present invention, and shall be
understood as the protection scope of the present invention, but
not limited to these specific statements and embodiments. Other
specific variations and combinations may be made by those ordinary
skilled in the art without departing from the essence of the
present invention in accordance with the technical implications
disclosed by the present invention. These variations and
combinations shall still be included in the protection scope of the
present invention.
* * * * *